igneous
Rounded pebble, likely granite or granitic gneiss
Granite: quartz + feldspar + mica; the specimen may be a granitic metamorphic variant
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pink, gray, and white granular crystals with a dull to slightly vitreous luster, no obvious cleavage on the rounded surface, and typical specific gravity around 2.6–2.7.
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Physical properties
Hardness about 6–7 Mohs; pink, gray, and white granular crystals with a dull to slightly vitreous luster, no obvious cleavage on the rounded surface, and typical specific gravity around 2.6–2.7.
Formation & geological history
Formed by slow crystallization of silica-rich magma deep underground, or by metamorphism of granite; commonly Paleozoic to Precambrian in age, then rounded by stream or beach abrasion.
Uses & applications
Used as crushed aggregate, building stone, countertops, monuments, and decorative landscaping rock; this small pebble has minimal commercial value.
Geological facts
The visible interlocking grains and pink feldspar are characteristic of granitic rock. Rounding indicates transport by water, waves, or glacial action.
Field identification & locations
Look for visible quartz, pink/white feldspar, and black mica in a coarse, interlocking texture; a glassy streak or strong fizz with acid would argue against granite. Common in continental mountain belts, glacial deposits, river gravels, and beaches.
